Ladder.



M. BARTOS & J.- BRAUN STEIN.

LADDER. v APPLICATION FILED AUG. 28,.1 908. 933,816, Patented Sept. 14,1909.

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M. BARTOS & J. BRAUNSTEIN.

LADDER.

APPLICATION FILED AUG. 28, 1908.

933,816. Patented Sept. 14,1909.-

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UNITED STATES PATENT OFFICE.

MORIS BARTOS AND JULIUS BRAUNSTEIN, OF NEW YORK, N. Y.

LADDER.

To all whom it may concern:

Be it known that we, Moms BAR'ros, a subject of the King of Austria, and JULIUS BRAUNSTEIN, a citizen of the United States of America, and residents of the city, county, and State of New York, have invented certain new and useful Improvements in Ladders, of which the following is a specification.

This invention relates to knock down furniture and is in the present instance embodied in a collapsible ladder the main features of which are that the uprights supporting the steps are formed to telescope one into another and the same is also true of the supporting stays.

Another feature is a locking mechanism by means of which each step is securely locked in position after the ladder is set up.

The preferred form of the invention is shown in the accompanying drawing in which Figure 1 is a perspective view of a step ladder embodying our invention. Fig. 2 is a detailed view partly in section of parts shown in Fig. 1 and looking in the direction of arrow 2. Fig. 3 is a front view of the lower part of the ladder. Fig. 4 is a view similar to Fig. 3 but showing the parts (collapsed. Figs. 5, 6 and 7 are detailed views of the locking mechanism showing the same in two different positions. Fig. 8 is a sectional view taken on line 88 of Fig. 1 and Fig. 9 is a plan view of the top shelf. Fig. 10 is a view of a ladder showing a modification and with parts removed.

The reference numeral 10 denotes the various sections of which the uprights of the ladder is composed and each section contains a step 11 which preferably made of a thin 1 piece of material having the bent edges 12 and as seen in Fig. 8 is provided with a tongue 13 adapted to fit inside the section 10 and the edges 12 are carried outside said section 10 and form rests 14. The step is inserted in the upright in the manner shown in Fig. 8 and is then twisted until it assumes the position shown in Fig. 2 where the surface of the step forms an acute angle with the front'surface 15 of the section 10. In other words when the ladder is set up and the uprights are inclined the steps are horizontal. At the point in the upright sections where the step is to be located there is provided holes as 16 through which locking members 17 are adapted to pass so that when Specification of Letters Patent. Patented Sept. 14, 1909.

Application filed August 28, 1908.

Serial No. 450,768.

the said locking members are locked in eX- panded position the steps cannot be removed.

As seen in the drawings the locking members 17 are carried by a base 18 and guided in the sides thereof and on pins 19 by slots 20. The locking members are interlocked by the lever 21 which is pivoted at 22 in the base 18 and is provided with forks 23 which cooperate with pins 24 of which there is one in each locking member 17. The one looking member is provided with notches 25 which are alternately engaged by a depending lug on the spring 26, the one end of which bears against the key 27.

The operation of the locking mechanism is readily understood from Figs. 5 and 6 which show respectively the locking members 1'7 in unlocked and locked position. The various members are kept in position on the base 18 by a cover plate 28 through which the knob 29 of the key projects and the locking mechanism is retained on the step underneath the same by strips 30 which are riveted or otherwise fastened to the step. The uprights formed by the sections 10 are prevented from spreading by a bottom plate 31 having points 32 to prevent it from slipping and at the top a rod33 passes through the two top sections 10 and carries between screwed into one another and the top sections into the bosses 35. In this manner-the rod 33 becomes a pivot around which the stays move so that the ladder may be inclined at any suitable angle and also folded together for moving it about. The stays are prevented from spreading by a rod 38 engaging screw eyes 39 and. when the ladder is set up rods 10 engaging screw eyes ll on the stays and the perforated end 12 of one of the locking members prevents spreading of the stays from the ladder section. At the top of the ladder is riveted a double shelf 43 hinged at 14 and provided with a small lever 45 pivoted at 16. When the shelf is unfolded.

as shown in Fig. 9 the lever 45 is turned to support the lea portion 17. When the-ladder is knocked down the leaf portion is provided with a bail 49 which when the ladscrewed one into another and moved about their pivots 33 until the rods are locked in position, also rod 38. The points 32 on the bottom plate 31 prevent the ladder from slipping. hen it is desired to transport the ladder the rods 38 and I0 are lifted off and the screw eyes 89 and 4L1 unscrew-ed.

lhe various sections 37 are unscrewed and slipped one into the other, the shelf 43 is folded over and now the ladder may be laid down on the floor, all the locking members 17 withdrawn per Fig. 5 and all the sections a 10 may be telescoped within the bottom section, the steps all falling down one upon the other as it will be understood that the tongues 13 are all of the same size to fit inside the top section 10. In this manner all the sections may be collapsed as indicated in 1 Fig. 4. The section 37 and rods 38 and 40 may then be packed in between the tele-: scoped bottom sections and tied thereto in any convenient manner, after which the bail 4L9 pulled out from the catch .50 and raised as shown in Fig. l and the ladder may easily be transported or carried.

' In Fig. 10 we have shown a ladder con-' structed on the same principle as the oneshown in F 1g. 1 but in Which the steps 11 are riveted or otherwise fastened to the upright sections 1 0. In this instance the locking members 1 are operated as aforesaid but pass through openings at the upper portion of each section and openings 56 in the lower portion of the section above. So that .in this instance the locking mechanism directly interlocks the two adjacent sections and supports the section above. While the ladder constructed as shown in Fig. 10 is not fully as collapsible as the one shown in Fig. 1 it embodies the same principle and still possesses great advantage over a nonoollapsible ladder. It will of course be understood that while the locking mechansaid uprights of hollow telescopical construction, said steps having tongues engaging the inside of the hollow portion of said uprights and means for locking said steps in position.

2. In a ladder, the combination ofsteps, and :telescopical sections forming uprights, said uprights of hollow telescopical construction, said steps having tongues engaging the inside of the hollow portion of said uprights, means for locking said steps in position, said steps between said uprights and means for pivoting said steps to said up rights.

3. In a ladder, the combination of steps,

and telescopical sections forming uprights, said uprights of hollow telescopical construction, said steps having tongues engaging the inside of the hollow portion of said uprights, said steps between said uprights, aneans for pivoting said steps to said uprights and means introduced between said uprights and said steps for locking the latterin position.

4t. Ina ladder, thecombination of'steps, and telescopical sections forming uprights, said uprights of hollow. telescopical construction, said steps having tongues engaging the inside of the hollowportion of said uprights, said steps between said uprights, means for pivoting said steps to said uprights and means introduced between said uprights and said steps for locking the latter in position, and means for telescoping said sections within the length and extreme diameter of one section of said uprights.

Signed at New York, N. Y., this 25th day of Aug. 1908.

MORIS BAR'IOS. JULIUS BRAUNSTEIN.

Vitnesses:

IVAN KoNIesBERG, LOUISE ENDERLE. 

